A swing cylinder that reduces structural wear

Abstract

This utility model relates to the field of hydraulic power machinery technology and discloses a swing cylinder for reducing structural wear. It includes a cylinder barrel with a gear ring fixedly welded to the outer surface of its left end. An output shaft is disposed inside the cylinder barrel, and a piston sleeve is disposed on the outer surface of the output shaft. Cylinder heads are installed at both ends of the cylinder barrel, and buffer components are disposed on the inner sides of both cylinder heads. This swing cylinder for reducing structural wear, by setting up buffer components, automatically compensates for axial misalignment caused by installation errors or uneven loads during output shaft rotation by using roller bearings at both ends of the output shaft, avoiding wear caused by localized stress concentration. Simultaneously, by setting up T-shaped sealing rings, it not only provides good sealing performance, preventing dust intrusion and hydraulic oil leakage, but also reduces the impact load during cylinder start-up, stop-up, and reversing due to its rubber material, thereby improving overall stability.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic power machinery technology, specifically to a swing cylinder that reduces structural wear. Background Technology

[0002] As a key component that converts hydraulic energy into reciprocating oscillating mechanical energy, the oscillating cylinder transforms the linear motion of the piston into the oscillating motion of the output shaft through a helical thread meshing. Its significant feature is its extremely high efficiency. The longer the linear motion of the piston, the greater the rotational motion. It uses hydraulics to generate very high torque in a very small space. The oscillating cylinder has been successfully applied in almost all fields that require limited rotational motion and high torque.

[0003] An existing patent (publication number: CN219622981U) discloses a swing cylinder, including a cylinder barrel. A hollow screw is movably disposed inside the cylinder barrel, and the hollow screw divides the cylinder body into a rod chamber and a rodless chamber. A fixed screw is fixedly connected to the rear end of the cylinder barrel. The fixed screw passes through the hollow screw and is threadedly connected to the hollow screw to form a first helical pair. The hollow screw is threadedly connected to an output nut to form a second helical pair. The output nut is rotatably connected to the cylinder barrel and the hollow screw, and the output nut is axially limited by an end cap and the fixed screw. The rear end face of the output nut protrudes from the cylinder and serves as a torque output connection end face.

[0004] Although the aforementioned patent increases the output torque and withstands higher loads by outputting torque through the output nut during use, avoids welding connections, and reduces damage to the hydraulic cylinder, it still has certain defects during use. The bearing between the screw and the cylinder is prone to localized excessive wear under off-center load conditions, leading to a decrease in swing accuracy. The impact load generated by the hydraulic cylinder during start-up, shutdown, and reversal will accelerate the wear of components such as seals and bearings, while also affecting the stability and machining accuracy of the equipment. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides a swing cylinder that reduces structural wear, possessing advantages such as high stability and strong buffering performance, thus solving the problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a swing cylinder for reducing structural wear, comprising a cylinder barrel, a gear ring fixedly welded to the outer surface of the left end of the cylinder barrel, an output shaft provided inside the cylinder barrel, a piston sleeve provided on the outer surface of the output shaft, cylinder covers installed at both ends of the cylinder barrel, and buffer components provided on the inner sides of both cylinder covers;

[0007] The buffer assembly includes a bearing sleeve disposed between the cylinder head and the output shaft. The inner wall of the bearing sleeve is fitted with roller bearings. By setting roller bearings at both ends of the output shaft, the misalignment of the axis caused by installation errors or off-center loads is automatically compensated, avoiding wear caused by local stress concentration. The inner side of the bearing sleeve is in contact with the output shaft. The outer surface of the cylinder is provided with two oil injection ports.

[0008] Furthermore, the output shaft is internally threaded to the piston sleeve, the cylinder is externally threaded to the piston sleeve, and the maximum stroke of the piston sleeve is the distance between two oil inlets.

[0009] The above scheme uses a piston sleeve that is threadedly connected to both the output shaft and the cylinder, allowing the piston sleeve to move stably while the output shaft rotates.

[0010] Furthermore, T-grooves are provided on both the outer and inner sides of the piston sleeve, and T-shaped sealing rings are installed in the T-grooves of the piston sleeve. The T-shaped sealing rings are made of rubber, and the T-shaped sealing rings are slidably connected to the corresponding output shaft and cylinder respectively.

[0011] Through the above solution, the T-type sealing ring can not only provide good sealing performance during use, preventing dust intrusion and hydraulic oil leakage, but also reduce the impact load during cylinder start-up, shutdown and reversal through its own rubber material, thereby improving the overall stability.

[0012] Furthermore, an O-ring is installed between the cylinder head and the cylinder barrel.

[0013] The above solution uses O-rings to seal the cylinder head and cylinder, preventing dust intrusion and hydraulic oil leakage.

[0014] Furthermore, an annular sealing ring and two dustproof rings are installed between the cylinder head and the output shaft, with the annular sealing ring located between the two dustproof rings.

[0015] The above solution, using an annular sealing ring and a dustproof ring, can seal the cylinder head and output shaft, preventing dust from entering the cylinder from between the cylinder head and output shaft.

[0016] Furthermore, each cylinder head is provided with a cover plate on its outer side, and the cover plate is threadedly connected to the cylinder barrel.

[0017] The above solution allows the cylinder head to be kept stable by the cover plate. When the cylinder head needs to be removed, the cover plate is rotated to separate it from the cylinder, and then the cylinder head can be removed.

[0018] Compared with the prior art, the technical solution of this utility model has the following beneficial effects:

[0019] This swing cylinder, designed to reduce structural wear, incorporates a buffer assembly. During output shaft rotation, roller bearings at both ends of the output shaft automatically compensate for misalignment caused by installation errors or uneven loading, preventing wear due to localized stress concentration. Furthermore, the T-shaped sealing ring provides excellent sealing, preventing dust intrusion and hydraulic oil leakage. Its rubber material also reduces impact loads during cylinder start-up, shutdown, and reversal, thereby improving overall stability. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present application;

[0021] Figure 2 This is a sectional view of the overall output isometric view of this application;

[0022] Figure 3 This is a side view of the overall piston sleeve of this application;

[0023] Figure 4 This is a structural diagram of the overall buffer assembly of this application;

[0024] Figure 5 This is a side view of the overall output axis of this application.

[0025] In the picture:

[0026] 1. Cylinder; 2. Gear ring; 3. Output shaft; 4. Piston sleeve; 5. Cylinder head;

[0027] 6. Buffer assembly; 601. Bearing sleeve; 602. Roller bearing;

[0028] 7. Oil inlet; 8. T-ring seal; 9. O-ring seal; 10. Annular seal; 11. Dustproof ring; 12. Cover plate. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] Please see Figure 1 , Figure 2 and Figure 3The swing cylinder for reducing structural wear in this embodiment includes a cylinder barrel 1. A gear ring 2 is fixedly welded to the outer surface of the left end of the cylinder barrel 1. An output shaft 3 is provided inside the cylinder barrel 1. A piston sleeve 4 is provided on the outer surface of the output shaft 3. Cylinder heads 5 are installed at both ends of the cylinder barrel 1. Buffer components 6 are provided on the inner side of both cylinder heads 5.

[0031] Please see Figure 2 , Figure 3 and Figure 4 The buffer assembly 6 includes a bearing sleeve 601 disposed between the cylinder head 5 and the output shaft 3. The inner wall of the bearing sleeve 601 is fitted with roller bearings 602. By setting roller bearings 602 at both ends of the output shaft 3, the misalignment of the axis caused by installation error or off-center load is automatically compensated, and local stress concentration is avoided to prevent wear. The inner side of the bearing sleeve 601 is in contact with the output shaft 3. Two oil filling ports 7 are provided on the outer surface of the cylinder barrel 1.

[0032] Please see Figure 2 , Figure 3 and Figure 5 The output shaft 3 is internally threaded to the piston sleeve 4, and the cylinder 1 is externally threaded to the piston sleeve 4. The maximum stroke of the piston sleeve 4 is the distance between the two oil inlets 7. Through the threaded connection between the piston sleeve 4 and the output shaft 3 and the cylinder 1 respectively, the piston sleeve 4 can move stably during the rotation of the output shaft 3.

[0033] Please see Figure 2 , Figure 3 and Figure 4 Both the outer and inner sides of the piston sleeve 4 are provided with T-slots, and T-slot seals 8 are installed in the T-slots of the piston sleeve 4. The T-slot seals 8 are made of rubber. The T-slot seals 8 are slidably connected to the corresponding output shaft 3 and cylinder 1 respectively. During use, the T-slot seals 8 can not only provide good sealing performance to prevent dust intrusion and hydraulic oil leakage, but also reduce the impact load during start-up, stop-up and reversal of the oil cylinder due to their own rubber material, thereby improving the overall stability.

[0034] Please see Figure 2 , Figure 3 and Figure 4An O-ring 9 is installed between the cylinder head 5 and the cylinder barrel 1. The O-ring 9 can seal the cylinder head 5 and the cylinder barrel 1 to prevent dust intrusion and hydraulic oil leakage. An annular seal 10 and two dustproof rings 11 are installed between the cylinder head 5 and the output shaft 3. The annular seal 10 is located between the two dustproof rings 11. The annular seal 10 and the dustproof rings 11 can seal the cylinder head 5 and the output shaft 3 to prevent dust from entering the cylinder barrel 1 from between the cylinder head 5 and the output shaft 3. A cover plate 12 is provided on the outer side of the cylinder head 5. The cover plate 12 is threaded to the cylinder barrel 1. The cover plate 12 can maintain the stability of the cylinder head 5. When it is necessary to remove the cylinder head 5, rotate the cover plate 12 to disengage the cover plate 12 from the cylinder barrel 1, and then the cylinder head 5 can be removed.

[0035] It should be noted that during use, avoid prolonged operation under critical load or high speed to reduce fatigue wear of seals and bearings. At the same time, control the hydraulic oil temperature within a suitable range, which can be adjusted by installing an external radiator or cooler. Avoid frequent start-stop during use, as the momentary start-stop will cause a sudden temperature change, thus reducing fretting wear caused by thermal expansion and contraction of materials. After prolonged use, the bearing sleeve 601 and roller bearing 602 need to be replaced.

[0036] The working principle of the above embodiment is as follows: During use, hydraulic oil enters the interior of cylinder 1 through oil inlet 7, pushing bearing sleeve 601 to move. The movement of bearing sleeve 601 drives output shaft 3 to rotate. Through the threaded connection between bearing sleeve 601, output shaft 3 and cylinder 1, the reciprocating movement of bearing sleeve 601 causes bearing sleeve 601 to rotate reciprocally. The movement of bearing sleeve 601 causes T-shaped sealing ring 8 to move, thereby drawing lubricating oil from oil tank into the interior of cylinder 1. The lubricating oil lubricates the components inside cylinder 1.

[0037] When the output shaft 3 is misaligned due to installation error or off-center load during rotation, the end of the output shaft 3 will press against the bearing sleeve 601. While ensuring that the output shaft 3 can rotate stably, the bearing sleeve 601 transforms the original point-to-point sliding contact between the output shaft 3 and the cylinder 1 into a face-to-face rolling connection, thus avoiding local stress concentration that could cause wear on the output shaft 3 and the cylinder 1.

[0038] Meanwhile, during use, by setting the T-type sealing ring 8, the T-type sealing ring 8 can not only provide good sealing for the bearing sleeve 601 during the movement of the bearing sleeve 601, preventing dust intrusion and hydraulic oil leakage, but also reduce the impact load during the start-up, stop and reversal of the oil cylinder through its own rubber material, thereby improving the overall stability.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0040] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A swing cylinder for reducing structural wear, comprising a cylinder barrel (1), characterized in that: A gear ring (2) is fixedly welded to the outer surface of the left end of the cylinder (1). An output shaft (3) is provided inside the cylinder (1). A piston sleeve (4) is provided on the outer surface of the output shaft (3). Cylinder heads (5) are installed at both ends of the cylinder (1). Buffer components (6) are provided on the inner side of both cylinder heads (5). The buffer assembly (6) includes a bearing sleeve (601) disposed between the cylinder head (5) and the output shaft (3). The inner wall of the bearing sleeve (601) is fitted with a roller bearing (602). The inner side of the bearing sleeve (601) is in contact with the output shaft (3). The outer surface of the cylinder (1) is provided with two oil inlets (7).

2. The swing cylinder for reducing structural wear according to claim 1, characterized in that: The output shaft (3) is internally threaded to the piston sleeve (4), the cylinder (1) is externally threaded to the piston sleeve (4), and the maximum stroke of the piston sleeve (4) is the distance between the two oil inlets (7).

3. The swing cylinder for reducing structural wear according to claim 1, characterized in that: The piston sleeve (4) has T-grooves on both its outer and inner sides. T-shaped sealing rings (8) are installed in the T-grooves of the piston sleeve (4). The T-shaped sealing rings (8) are slidably connected to the corresponding output shaft (3) and cylinder (1).

4. A swing cylinder for reducing structural wear according to claim 1, characterized in that: An O-ring (9) is installed between the cylinder head (5) and the cylinder barrel (1).

5. A swing cylinder for reducing structural wear according to claim 1, characterized in that: An annular seal (10) and two dust seals (11) are installed between the cylinder head (5) and the output shaft (3), with the annular seal (10) located between the two dust seals (11).

6. A swing cylinder for reducing structural wear according to claim 1, characterized in that: The cylinder head (5) is provided with a cover plate (12) on the outside, and the cover plate (12) is threadedly connected to the cylinder (1).

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